It's an improvised funnel with a tiny tip made out of a disposable plastic glass and a Bic ballpoint pen cap.

Step 1: What Do You Need ?

- a disposable plastic glass
- the cap of a Bic ballpoint pen (or anything similar)

- if required : some glue to fill potential leaks

Step 2: Build It ...

Make a hole at the bottom of the plastic glass.
Insert the cap.

Fill the leaks with glue if required and let it dry.

Step 3: Use It ...

Voila ...

Congratulations =o)
you could use stoner tactics... basically lighter underneath to melt the hole a bit and jam the pen lide through and it makes a pretty good seal most of the time

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